Effect of cellular precipitation on the superconducting properties of Al-16 70% At-Ag alloy

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Abstract
The influence of the growth of the cellular precipitation on the superconducting properties of Al-16–70% At-Ag has been studied. A metallurgical investigation has been made by optical microscopy, transmission electron microscopy and residual resistivity measurements at 4.2 K. Critical temperature and critical fields have been deduced from the measurements of the magnetization curve. The results can be explained by adding separately the superconducting properties of the intragranular and cellular regions. By considering volume proximity effects between the normal Ag-rich inhomogeneities and the superconducting Ag-depleted matrix, each region of precipitation is characterized as a type I or a type II superconductor. The results also indicate the conditions of validity of the Gorkov-Goodman relation between the upper critical field Hc2 of a superconducting material and ρe the residual resistivity.